Abstract: A hopper assembly for a hopper-type texture spray gun applicator apparatus; the hopper assembly including a hopper reservoir housing such as an elongated tubular housing having a specific length to diameter (L/D) ratio. The hopper assembly is adapted for being removably connected to a spraying apparatus such as a spray gun which is coupled to a pressure source such as an air compressor for atomizing texture material contained in the hopper reservoir housing of the hopper assembly. The hopper assembly, the spray gun and the air pressure source may be used together to comprise a hopper-type texture spray gun applicator adapted for spraying texture material on work surfaces such as interior walls, floors and ceilings of a building.